ECN Forum Forums General Topics of the Trade General Discussion Area Delta Systems

Ahh, I get it. At least a few variable speed drives are capable of operating at an output voltage that is higher than the input voltage. For some applications it might make sense to install a VSD simply for voltage control, leaving the frequency conversion aspect of the device as a nifty side effect. Note that _most_ VSD systems are not capable of _boosting_ the output voltage significantly above the input.

-Jon

As the converters typically work with an intermediate DC circuit at (root)2*ACvoltage, it is not very difficult to realise. DC is then switched according to what the motor needs, voltage and frequency can (but not necessarily) be varied in wide ranges as long as the motor survives it.
It is a price, space, and EMC discussion.

(edited for Germanism)

[This message has been edited by Wolfgang (edited 02-03-2006).]

This is a small mom and paw shop with a used compressor let me check the leads and get more info. Thanks

Mike, can you get the nameplate info off the motor?

Dnk..

Ah..... A VSD type device, I'm with you now.

I just saw frequency converter and started thinking along the lines of fixed voltage rotary converter, or electronic equivalent.

Btw, Wikipedia doesn't know VSD at all!
But it knows: VFD, frequency converter, frequency changer.

European industry also sells it as (solid) fr. inverter! The older were rotating ones.

What a mess!

480 is a standard voltage. So are 240 and 208.
Why not just use a three-phase transformer? They work both directions, you know!